[wasm] [asmjs] Route asm.js warnings to the dev console.

src/asmjs/asm-typer.h

Index: src/asmjs/asm-typer.h
diff --git a/src/asmjs/asm-typer.h b/src/asmjs/asm-typer.h
index 33ba39e7cce0b052d9ebff1c4f04e44137860b6c..723731bcdd309c203ef5de69c93dd7a85ebb28a8 100644
--- a/src/asmjs/asm-typer.h
+++ b/src/asmjs/asm-typer.h
@@ -16,6 +16,7 @@
 #include "src/ast/ast-types.h"
 #include "src/ast/ast.h"
 #include "src/effects.h"
+#include "src/messages.h"
 #include "src/type-info.h"
 #include "src/zone/zone-containers.h"
 #include "src/zone/zone.h"
@@ -78,7 +79,8 @@ class AsmTyper final {
   bool ValidateAfterFunctionsPhase();
   void ClearFunctionNodeTypes();
 
-  const char* error_message() const { return error_message_; }
+  Handle<JSMessageObject> error_message() const { return error_message_; }
+  const MessageLocation* message_location() const { return &message_location_; }
 
   AsmType* TypeOf(AstNode* node) const;
   AsmType* TypeOf(Variable* v) const;
@@ -138,7 +140,7 @@ class AsmTyper final {
     bool IsHeap() const { return standard_member_ == kHeap; }
 
     void MarkDefined() { missing_definition_ = false; }
-    void SetFirstForwardUse(int source_location);
+    void SetFirstForwardUse(const MessageLocation& source_location);
 
     StandardMember standard_member() const { return standard_member_; }
     void set_standard_member(StandardMember standard_member) {
@@ -153,7 +155,7 @@ class AsmTyper final {
 
     bool missing_definition() const { return missing_definition_; }
 
-    int source_location() const { return source_location_; }
+    const MessageLocation* source_location() { return &source_location_; }
 
     static VariableInfo* ForSpecialSymbol(Zone* zone,
                                           StandardMember standard_member);
@@ -165,11 +167,8 @@ class AsmTyper final {
     // missing_definition_ is set to true for forward definition - i.e., use
     // before definition.
     bool missing_definition_ = false;
-    // source_location_ holds the line number that first referenced this
-    // VariableInfo. Used for error messages.
-    // TODO(bradnelson): When merged with console change, this should
-    // become a source location.
-    int source_location_ = -1;
+    // Used for error messages.
+    MessageLocation source_location_;
   };
 
   // RAII-style manager for the in_function_ member variable.
@@ -397,7 +396,8 @@ class AsmTyper final {
   static const int kErrorMessageLimit = 128;
   AsmType* fround_type_;
   AsmType* ffi_type_;
-  char error_message_[kErrorMessageLimit];
+  Handle<JSMessageObject> error_message_;
+  MessageLocation message_location_;
   StdlibSet stdlib_uses_;
 
   SourceLayoutTracker source_layout_;